Earlier quoted context omitted.
I would hope so, but Disney is already known for repeatedly pulling out old works from the market and re-releasing them later on, since AFAIK the VCR era, so I wouldn't bet on them refraining from shenanigans on their streaming service.
The CEO of Disney has said that the "Disney Vault" concept is dead. That being said, they still have to wait for licensing deals to expire to have everything on Disney+.
Also, I may have to wait until my smart TV supports it. We never had these kind of problems when we just had cable. (Or did we?)